2004 Chevrolet Silverado pressure testing coolant system

Tiny
RANDY SHARP
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
When pressure testing a cooling system do I have to plug or pinch off the overflow tube?
Wednesday, May 6th, 2015 AT 4:44 PM

3 Replies

Tiny
ED-WEEZY21
  • MECHANIC
  • 248 POSTS
Yes you do. Otherwise you're going to dump our pressure right into the overflow reservoir.
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Wednesday, May 6th, 2015 AT 5:02 PM
Tiny
RANDY SHARP
  • MEMBER
  • 161 POSTS
You understand this is a expansion tank it has no reservoir tank the pressure tester goes right on to the cap of the expansion tank and it just has a overflow that is on the top neck of tank it is a short tube that goes to the ground.
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Thursday, May 7th, 2015 AT 10:38 AM
Tiny
ED-WEEZY21
  • MECHANIC
  • 248 POSTS
Either or it's the same concept just changes where the pressure is going to get dumped to. If you don't pinch off that hose, you're sending your pressure outside. You need to seal the entire system in order to hold a pressure and find any leaks. Whether it's a tube that runs to an overflow tank or a tube coming out from an expansion tank, the tube needs to be blocked.
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Thursday, May 7th, 2015 AT 10:45 AM

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